3122921 has 4 divisors (see below), whose sum is σ = 3158100. Its totient is φ = 3087744.

The previous prime is 3122893. The next prime is 3122927. The reversal of 3122921 is 1292213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1292213 = 13 ⋅99401.

It can be written as a sum of positive squares in 2 ways, for example, as 1597696 + 1525225 = 1264^2 + 1235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3122921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3122893 and 3122902.

It is not an unprimeable number, because it can be changed into a prime (3122927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17456 + ... + 17633.

It is an arithmetic number, because the mean of its divisors is an integer number (789525).

Almost surely, 2^3122921 is an apocalyptic number.

It is an amenable number.

3122921 is a deficient number, since it is larger than the sum of its proper divisors (35179).

3122921 is an equidigital number, since it uses as much as digits as its factorization.

3122921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35178.

The product of its digits is 216, while the sum is 20.

The square root of 3122921 is about 1767.1788251334. The cubic root of 3122921 is about 146.1684582095.

The spelling of 3122921 in words is "three million, one hundred twenty-two thousand, nine hundred twenty-one".